Unreal Engine Issues

crash at checkUERenderCommandPipeIsReplaying in RenderScenecpp

Drawing a material to a render target when that material samples an RVT can cause an editor crash. In our testing, the check() did not always occur on the first PIE session, but would always occur ...

Flickering shadows/GI when DrawMaterialToRenderTarget is called per tick in PIE

When DrawMaterialToRenderTarget function is called on tick and actors are spawned in game, the lumen shadow/GI visually flickers. Debugging shows that the lumen screen probes are flickering as well. ...

Distant mesh / vista have visible Lumen bounces

Objects far outside of the Lumen Scene don't temporally accumulate screen traces, leading to heavy flickering. It appears that the temporal reprojection is failing when comparing the depth in "Scree ...

Displacement + TAA causes "vibrating"/"buzzing" artifacts

There is a buzzing artifact on shadows that is seen in the provided test project. The problem seems to be far more subtle when VSM is turned off. Licensee mentions that turning r.Velocity.ForceOutpu ...

Strange results with HeightToNormalSmooth on Nanite meshes

This appears to also occur on meshes that aren't set to Enable Nanite at all.  [Image Removed] ...

RayTracingGeometry.UpdateRHI(); crashes at checkf BuildParams.IsEmpty()

When custom RayTracingGeometry is created, a crash is triggered by an assert at: Engine\Source\Runtime\Engine\Private\Rendering\RayTracingGeometryManager.cpp line 252  "Unexpected entries in BuildP ...

Ensure when changing the separate translucency buffer resolution and open the map in which PostProcessVolume is placed

FDeferredDecalProxy cannot be initialized to not fade even if FadeDuration is set to 0

FDeferredDecalProxy always fade because InitializeFadingParameters is always called and leaves InvFadeDuration at 1.0 and the LifetimeAlpha calculation in FDeferredDecalPS::SetParameters gets a very ...

Depth of field and Refraction issue

Refraction does not adjust the scene depth texture, leading to a mismatch between Scene Color samples and Scene Depth samples. ...

Virtual Texture materials don't fully deduplicate generated virtual texture stacks

During material compilation we track unique individual virtual texture "stacks" and then create a virtual texture page table for each, along with unique bindings for each page table in the shader co ...